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    <title>学生管理系统</title>
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<body>

<div class="content">
    <img src="./images/offline.png" alt="VaadinCRM is offline" class="offline-image"/>
    <h1>服务器异常！</h1>
    <p>请重新启动服务器...</p>
</div>
<script>
  window.addEventListener('online', location.reload);
</script>
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